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📅 2026-06-20 | 📂 Bootstrap
```html Page Not Found | Online Tutorial

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404 NOT FOUND!

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The 404 page is an essential part of any website and plays a crucial role in user experience and SEO optimization. A 404 error occurs when users access pages that do not exist or have been deleted on the site. If webmasters don’t set up a custom 404 page, dead links may appear, which can negatively impact search engine indexing.

Origin of 404 Not Found

Legend has it that before the Third Industrial Revolution, the form of the Internet was a large central database located inside Room 404. At that time, all requests were manually processed by humans. If the requested file wasn't found in the database or if there was a mistake in the request number, users would receive a message saying: "Room 404: File Not Found." After the rise of the modern Internet, people became accustomed to using 404 as the standard error code for missing files. Of course, historical verification shows that the legendary Room 404 never actually existed.

Two Major Benefits of Setting Up a 404 Page

  • Guide users not to close the site, enhancing user experience.
  • Prevent the appearance of broken/dead links on your website.

See more about HTTP Status Codes Introduction.

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